| 摘要 |
PURPOSE:To enable adaption to a high-energy radiation, by performing computation of position independently for each layer of a multilayer of MWPC detection means to obtain a high spatial resolution, counting rate characteristic and detection efficiency. CONSTITUTION:An MWPC is formed in two layers and cathode surfaces 1, 3 and 5 and anode surfaces 2 and 4 are laminated alternately in the direction Z in a chamber sealed at a high pressure with an inert gas with a high atomic number and a very small amount of a quenching gas. Numerous wires are arranged on surfaces 1 and 5 in the direction X extending in the Y way to output pieces X1 and X2 of X-way positional information while numerous wires are arranged on a surface 3 in the direction Y extending in the X way to output pieces Y1 and Y2 of Y-way positional information. Then, events causing an photoelectric effect in each layer is processed separately with position computing circuits 6 and 7 provided independently at respective layers to be counted. The back scattering is identified with a coincidence circuit 8 and an energy discrimination circuit 9 and pieces X2 and Y2 of information are selected to count.
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